Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
May 31, 2014
May 31, 2013
Summary Of Significant Accounting Policies [Line Items]    
Net loss $ (12,431,413) $ (9,568,301)
Insurance coverage, per depositor at each financial 250,000 250,000
Balance in excess of federally insured limits 4,589,000 386,000
Estimated future unvested option forfeitures 0.00%  
Deferred offering costs 68,292 96,930
Direct costs associated with the convertible notes 120,000  
Amortization of deferred offering costs 120,000  
Common stock options and warrants to purchase 95,100 95,100
Common stock options and warrants to purchase 30,806,373 18,146,938
Face amount of Notes 7,221,250 6,588,250
Additional common shares if convertible debt is converted to common stock 5,695,000  
Unrecognized benefits 0 0
Convertible Debt
    
Summary Of Significant Accounting Policies [Line Items]    
Face amount of Notes 4,271,250  
Stock Rescission Liability
    
Summary Of Significant Accounting Policies [Line Items]    
Deferred offering costs 68,300 97,000
Equity Securities
    
Summary Of Significant Accounting Policies [Line Items]    
Deferred offering costs $ 2,084,000  
Series B Convertible Preferred Stock
    
Summary Of Significant Accounting Policies [Line Items]    
Preferred Stock Shares authorized to be issued 400,000 400,000
Common stock options and warrants to purchase 95,100  
Common shares issued upon conversion of preferred stock 951,000  
Maximum
    
Summary Of Significant Accounting Policies [Line Items]    
Preferred Stock Shares authorized to be issued 5,000,000